var xmlHttp

function showHint(str) {
	if (str.length == 0) {
		document.getElementById("txtHint").innerHTML = ""
		return
	}
	xmlHttp = GetXmlHttpObject()
	if (xmlHttp == null) {
		alert ("浏览器不支持Http request")
		return
	}
	var url = "gethint.php"
	url = url + "?q=" + str
	url = url + "&sid=" + Math.random()
	xmlHttp.onreadystatechange = stateChanged
	xmlHttp.open("GET",url,true)
	xmlHttp.send(null)
}

function stateChanged() {
	if (xmlHttp.readyState == 4 || xmlHttp.readyState == "complete") {
		document.getElementById("txtHint").innerHTML = xmlHttp.responseText
	}
}

function GetXmlHttpObject() {
	var xmlHttp = null
	try {
		xmlHttp = new XMLHttpRequest();
	}
	catch (e) {
		try {
			xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e) {
			xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return xmlHttp;
}

